Abstract
Cutaneous extranodal NK/T-cell lymphoma, nasal type, and primary cutaneous g/d T-cell lymphoma (PCGD-TCL) are rare cutaneous lymphoid neoplasms with overlapping features. Although EBV positivity favors the former, EBV+ PCGD-TCL has recently been reported. They also share cytotoxic markers and a poor prognosis. Here we report an unusual case of cutaneous NK/T-cell lymphoma with overlapping features of PCGD-TCL in a 55-year-old man who also developed hemophagocytic lymphohistiocytosis. Although it presents the typical pathological and immunophenotypic features of a cutaneous NK/T-cell lymphoma and PCGD-TCL, it aberrantly expresses CD20, giving an impression of mixed populations of T cells and B cells that are commonly seen in reactive conditions. This rare case represents a diagnostic pitfall and intends to raise more awareness among both pathologists and dermatologists. The CD20 positivity may also provide a target for rituximab therapy.
Keywords
Cutaneous NK/T-cell lymphoma, primary cutaneous g/d T-cell lymphoma, hemophagocytic lymphohistiocytosis, CD20, rituximab
How to Cite
Xu, X., Romero, L., Kim, Y. & Zhao, X. F., (2017) “CD20-positive primary cutaneous extranodal NK/T-cell lymphoma”, Hematopathology 2(1), 19-23.
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